Were is a good place to easily farm chitain fragments in either campaign for lets say a war/monk. Or if your telling me off a spot in prophicies a war/monk or monk/anything or ranger/monk??? please get back to me
Just outside of Ran Musu garden is a good place for Chittin fragments. There just a lot of lvl 1-8 mantids easily killed by anything and they drop alot outside of there and each farming run only takes about 2 minutes so in like 1-2 hours your gonna be loaded.
You can try at Sage Lands and Majesty's Rest. Here Devoures drop like 5 or 6 Chittin Fragments at once (but they are lvl 14 and 17) and you can farm Moss Scarab spiders too.
Well, to go in the high end, I got boatloads of chitin in FoW from spiders and rock borer wurms. If you're confident that you can do it, it's by far the fastest way. You can get around 500-750 chitin in a good hour.
the area just outside anmoon, I farmed there for a while, jade jaws are chitin as well, also, fight the scarabs and devourers from hero's to augry rock, there's alot and you might make some cash on the way there
Dessert is the best, but not the easiest.
Old Ascalon is the easiest, but not the best. (This method will cost you some salvage kits as even a expert salvage kit salvages only 1 Chittin from the salvage item they drop there).